The Dispatch | Expert | Scudo Hub

With the map sensor, again the ecu knows what to expect. So you would get an error - so possibly the P0299 is low boost pressure measured by the MAP.
Blocking the EGR is worth doing - just been reading elsewhere about a fault where high exhaust pressure was pushing the EGR valve slightly open under aceleration, when it should be closed. In this case you would expect the ecu to work out something is wrong , but it didn't. You would see this in the data logs, assuming the EGR has position sensor.

I did consider the pressure sensor - however the ECU should use this to trim the values set for the pump. If the readings drift to far the a fault would be generated. I did mention the pressure sensor to the Delphi agent in Uxbridge and he said he had only ever seen one fail.
If the MAF sensor is dirty/faulty it can report back incorrect air intake. You can temporarily disconnect it and the ecu will default to calculated values. You can drive and see if the smoke is still there. The maf error codes will need to be reset again.

P1351 code for a diesel does point to a duff plug and or relay issue ...........

http://www.pikit.co.uk/peugeotmt/psa%20 … codes.html

I would suggest 18psi of boost is a little high for a standard setting It could mean a restriction or someones been fiddling ......
I Could be wrong I'd say an Hdi wastgate is not controled in the old school Method of shortening the wastegate actuator rod to increase a bit extra boost

Diesels do tend to be on the higher side of boost compared to a petrol engines.............

But i'd think nearer 10 -- 13psi boost from factory ..............

probably wants to go on a citroen's diagnostics (Lexia ?) get a reading and see what fault codes you get and a sqidge at the live parameters hopefully get some hard evidence as it's getting a bit guess work now.........

AnthonyExeter wrote:

No dpf on this van, its a 57 plate so too early.

If the turbo was knackered wouldnt it black smoke all the time?
Iv'e had the pipe off the inlet and and spins nice and freely.

Two things  really...........

Unless youv'e actually checked Don't assume NO DPF (To early)..........
My ill fated 307 HDI had a DPF(FAP) and it was a late 2003 reg..............

It's not universally to do with age ...........

Secondly. the Turbo only supplies boost on demand ....... So no not all the time (a different coulour of smoke maybe)

If you've been able to Spin the turbo impeller what was the end float like ?..........
{Did it have a lot of side to side movement or slack wobbley when you spun it up ?}
Were you able to see if any obvious damage to "Fins" on impeller to suggest a foreign object ?.......

Again Lots of reasons why .......
eg..... Is it a variable vane turbo?..........
AKA......Variable-geometry turbochargers /VGT's,  variable nozzle turbines/VNT's

Black smoke is a sign of unburnt diesel........
And your P0299 code sugests boost or lack of  possably why black smoke............

Confused when you say "plenty power when up to speed" But what's it like getting there ?..........
 
I'll assume you've checked for or don't hear any boost leaks............